Asked by andre
Solve the equation using exact values. Check for any extraneous roots. 9^2x+4(9^x)=21.
Answers
Answered by
Steve
(9^x)^2 + 4(9^x) - 21 = 0
(9^x + 7)(9^x - 3) = 0
...
(9^x + 7)(9^x - 3) = 0
...
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